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NFC: pn533: Target mode Tx fragmentation support

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In target mode, when we want to send frames larger than the max length
(PN533_CMD_DATAEXCH_DATA_MAXLEN), we have to split the frame in smaller
chunks and send them, using a specific working queue, with the TgSetMetaData
command. TgSetMetaData sets his own MI bit in the PFB.
The last chunk is sent using the TgSetData command.

Signed-off-by: Olivier Guiter <olivier.guiter@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Olivier Guiter 2013-09-23 12:24:39 +02:00 committed by Samuel Ortiz
parent 3c13b244de
commit 93ad42020c
1 changed files with 70 additions and 7 deletions
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77
drivers/nfc/pn533.c
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@ -150,6 +150,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
#define PN533_CMD_TG_GET_DATA 0x86
#define PN533_CMD_TG_SET_DATA 0x8e
#define PN533_CMD_TG_SET_META_DATA 0x94
#define PN533_CMD_UNDEF 0xff
#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
@ -374,6 +375,7 @@ struct pn533 {
struct work_struct mi_rx_work;
struct work_struct mi_tx_work;
struct work_struct mi_tm_rx_work;
struct work_struct mi_tm_tx_work;
struct work_struct tg_work;
struct work_struct rf_work;
@ -1702,6 +1704,46 @@ static void pn533_wq_tm_mi_recv(struct work_struct *work)
return;
}
static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp);
static void pn533_wq_tm_mi_send(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
struct sk_buff *skb;
int rc;
dev_dbg(&dev->interface->dev, "%s\n", __func__);
/* Grab the first skb in the queue */
skb = skb_dequeue(&dev->fragment_skb);
if (skb == NULL) { /* No more data */
/* Reset the queue for future use */
skb_queue_head_init(&dev->fragment_skb);
goto error;
}
/* last entry - remove MI bit */
if (skb_queue_len(&dev->fragment_skb) == 0) {
rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
skb, pn533_tm_send_complete, NULL);
} else
rc = pn533_send_cmd_direct_async(dev,
PN533_CMD_TG_SET_META_DATA,
skb, pn533_tm_send_complete, NULL);
if (rc == 0) /* success */
return;
dev_err(&dev->interface->dev,
"Error %d when trying to perform set meta data_exchange", rc);
dev_kfree_skb(skb);
error:
pn533_send_ack(dev, GFP_KERNEL);
queue_work(dev->wq, &dev->cmd_work);
}
static void pn533_wq_tg_get_data(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, tg_work);
@ -2668,6 +2710,11 @@ static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
status = resp->data[0];
/* Prepare for the next round */
if (skb_queue_len(&dev->fragment_skb) > 0) {
queue_work(dev->wq, &dev->mi_tm_tx_work);
return -EINPROGRESS;
}
dev_kfree_skb(resp);
if (status != 0) {
@ -2690,17 +2737,32 @@ static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
dev_dbg(&dev->interface->dev, "%s\n", __func__);
/* let's split in multiple chunks if size's too big */
if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
nfc_err(&dev->interface->dev,
"Data length greater than the max allowed: %d\n",
PN533_CMD_DATAEXCH_DATA_MAXLEN);
return -ENOSYS;
rc = pn533_fill_fragment_skbs(dev, skb);
if (rc <= 0)
goto error;
/* get the first skb */
skb = skb_dequeue(&dev->fragment_skb);
if (!skb) {
rc = -EIO;
goto error;
}
rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
pn533_tm_send_complete, NULL);
} else {
/* Send th skb */
rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
pn533_tm_send_complete, NULL);
}
rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
pn533_tm_send_complete, NULL);
if (rc < 0)
error:
if (rc < 0) {
dev_kfree_skb(skb);
skb_queue_purge(&dev->fragment_skb);
}
return rc;
}
@ -3111,6 +3173,7 @@ static int pn533_probe(struct usb_interface *interface,
INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
INIT_WORK(&dev->mi_tm_rx_work, pn533_wq_tm_mi_recv);
INIT_WORK(&dev->mi_tm_tx_work, pn533_wq_tm_mi_send);
INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
INIT_WORK(&dev->rf_work, pn533_wq_rf);
dev->wq = alloc_ordered_workqueue("pn533", 0);